#include <iostream>
using namespace std;
int x, a, b, c, nr;
int main()
{
cin >> x;
c = x % 10;
b = ( x / 10 ) % 10;
a = x / 100;
if ( a <= b && b <= c) nr = c*10 + b;
if ( a <= c && c <= b) nr = b*10 + c;
if ( b <= a && a <= c) nr = c*10 + a;
if ( b <= c && c <= a) nr = a*10 + c;
if ( c <= a && a <= b) nr = b*10 + a;
if ( c <= b && b <= a) nr = a*10 + b;
cout << nr;
return 0;
}